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gr-qc2021
Adiabatic Duality: Duality of cosmological models with varying slow-roll parameter and sound speed
Jiaming Shi, Zheng Fang, Taotao Qiu
There have been thousands of cosmological models for our early universe proposed in the literature, and many of them claimed to be able to give rise to scale-invariant power spectr…
gr-qc2020
Large against Trans-Planckian Censorship in Scalar-Tensor Theory?
Jiaming Shi, Taotao Qiu
In this paper, we discuss about the possibility to enhance the tensor-to-scalar ratio under the condition of Trans-Planckian censorship conjecture (TCC), thus $r\sim O(10^{-3})…
gr-qc2019
Dark matter candidate induced by Horndeski theory: dark matter halo and cosmological evolution
Jiaming Shi, Taishi Katsuragawa, Taotao Qiu
We study spherically symmetric solutions with a scalar field in the shift-symmetric subclass of the Horndeski theory. Constructing an effective energy-momentum tensor of the scalar…